 *{padding: 0;
    margin-bottom:0;
    border: 0;
}
 .box{
    width: 640px;
    height: 50px;
    overflow-x: scroll;
    overflow-y: hidden;
}
        ul{display:inline;
    white-space: nowrap;
}
        ul li{padding: 10px 20px;
    display: inline-block;
    background:pink;
    white-space:nowrap;
}